"The Acabians had not been seen since their escape from the Suscomdrome more than a hundred years ago. Most assumed them lost at sea. "The Acabian" was a stock character in ghost stories, always sailing silently into port on moonless nights, disembarking without a word, creeping into the city, bent on mischief and vengeance.
Source: _Voyage of the Alcathant_, anonymous, ca. the Blue Age"